Improvement in sewing or embroidering machines



A. W. JOHNSON. Improvement in Sewing and Embroidering Machinesg PatentedApril 2, 1872,

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a: 9a m goziafzlzio u UNITED STATES PATENT OFFICE.

ALBERT W. J OlilNSON, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO CHARLES E.HENDRICKS, OF SAME PLACE.

IMPROVEMENT I N SEWING OR EMBROIDERING MACHINES.

Specification forming part of Letters Patent No. 125,301, dated April 2,1872.

SPECIFICATION.

I, ALBERT W. J OHNSON, of New Haven, in the county of New Haven andState of Connecticut, have invented a new and usefulEmbroidering-Machine, of which the following is a specification,reference being had to the accompanying drawing, in which- Figure l is afront elevation of the main parts with the spreader shut. Fig. 2 is afront elevation of the parts shown in Fig. 1, which are above the table,with the spreader. opened. Fig. 3 is an end elevation of the parts shownin Fig. l with the spreader opened. Fig. 4 is an end elevation of theparts above the table with the looping-hook and its appendages swung outhorizontally. Fig. 5 is a reverse view of the parts shown in Fig. 4 inthe same position. Fig. 6 is a detached view of the looping-hook bar,showing the shape of the slot in its upper end.

The machine makes what is commonly known as a spread-chain stitch on theupper side of a fabric, and is made'to use a large embroider ing-thread.

The letter a indicates the table, like to a sewing-machine table,supported on suitable standards. Rotary motion is givento the shaft,which runs through the arm b, as is common in sewing-machines. The wheel0 is upon the end of this shaft. The needle cl, set in the needle-bar 6operates from beneath the table, its motion being giyen by commondevices in use for that purpose. What its motion is will be describedhereafter. Onthe endof the shaft, running through the arm b-which,forsake of convenience, is called the main shaft --is the I disk 12 intowhich screws the wrist-pin b passing through slots in the spreader-bar eand the looping-hook barf. The shape of the slot in the former isreadily seen in Figs. 3 and 4. The shape of the slot in the latter isbest seen in Fig. 6. The looping-hook bar is pivoted by the screw-pin fto the presser-foot bar g, dovetailed at its back into a correspondingslot in the pivot-plate h, which can be revolved a quarter of a circleon the main shaft, this motion being defined by the screws h runningthrough quarter-circle slots in the pivot-plate into the stationaryplate b which is on the arm b. This partial revolution is allowed forthe purpose of throwing the parts back into the position shown in Fig.4, so as to be out of the way when arranging cloth to be embroidered.The presser-foot bar has the presscr-foot g projecting downward from it,and the bar and foot are made to rise and fall, as desirable and nec-'essary, bymean s ofthe pin g extending through a straight slot in thepivot-plate; and also through the slot 9 in the cam g pivoted to theback side of the pivot-plate. The pivotplate and its appendages can onlybe swung back 'to the position shown in Figs. 4 and 5 when thepresser-foot is drawn up to the highest elevation allowed it; this beingthe only time when all the parts are in proper position to allow suchswinging back, and-this is prevented at all other times by the pin 9also extending through the straight slot in the pivotplate and into theslot h made in the back side of the pivot-plate. This slot is open tothe rear at the top W, and thus allows the pin to move to the rear whenit is at its highest point of travel. 7

' As the main shaft revolves from the observer,

Fig. 1, it causes the looping-hook f to vibrate back and forth with avariable motion, which will be described. The spreader e is pivoted i tothe looping-hookbar at e from whence it runs down through a slot in thelooping-hook bar, andthen, turning to the front, runs near.- ly to thepoint of the looping-hook. In fact, when the spreader is shut, itpractically forms a part of the loopin g-hook. The spring a tends tokeep. it always shut, but during each revolution of the main shaft, atthe proper time, the spreader-bar e is driven down, and its wedge-shapedlower end pushes under the upper end of the spreader, and opens itslower end from the looping-hook. The embroidering-thread comes up from aproperly-placed spool'under the table on the left side of the needle,Fig. 1, and passes through an eye in the needle near its point. is atthe top of its play, and just as it is about to descend, thelooping-hook, its spreader shut, moves to thefront and catches under thethread, between'it and the needle, and holds it while the needledescends, thus forming a loop. As

soon as the point of the needle descends so as to clear thelooping-hook, the spreader opens and spreads the loop, the hookmeanwhile remaining stationary, and while thus stationary the'needleagain comes 'up and passes through the spread loop. Now the hookretreats, thro w- When the needle in g off the loop onto the needle, andthe spreader shuts, but, while the needle is still up, again, withspreader shut, comes to the front and catches into the thread, as atfirst, above the loop just thrown off, and the retreating needle leavesthe loop on the cloth, and so on indefi nitely, thus forming achain-stitch. The cloth feeds from the front, Fig. 1, while the needleis down.

The feeder is of the ordinary construction and'operation, and it is notdeemed necessary to show it in the drawing. It surrounds the needle, andis slotted for the entrance of the needle through it, and is set in theelastic circularbed 'i, which surrounds the needle, which 1 isappropriately slotted for that purpose. This elastic bed i is a roundblock, resting upon the arm 2' pivoted at i to the bottom of the table,

and supported by the spring i Experiment has shown this elastic bed tobe an important. feature.

I claim as my invention 1. The combination of the looping-hook bar, thepresser-foot bur, andthe pivot-plate, constructed and operatedsubstantially ,as described.

2. The combination, with thelooping hookbar f, presser-foot bar g,pivoted plate h, and fixed plate b of the cam g and pin 9 all operatingas and for the purpose described.

3. In combination with the pivoted loopinghook and bar, the spreader,constructed substantially as described, pivotedto said bar. and operatedby the spreader-bar, substantially as described. 7 V

ALBERT W. JOHNSON.

Vitnesses:

WILLIAM B. STODDARD, CHAS. W. SHELTON.

